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Computers and Concrete   Volume 20, Number 1, July 2017, pages 085-97
DOI: https://doi.org/10.12989/cac.2017.20.1.085
 
A physically consistent stress-strain model for actively confined concrete
Sharif Shahbeyk, Mahshid Z. Moghaddam and Mohammad Safarnejad

 
Abstract     [Buy Article]
    With a special attention to the different stages of a typical loading path travelled in a fluid confined concrete test, this paper introduces a physically consistent model for the stress-strain curve of actively confined normal-strength concrete in the axial direction. The model comprises of the five elements of: (1) a criterion for the peak or failure strength, (2) an equation for the peak strain, (3) a backbone hydrostatic curve, (4) a transient hardening curve linking the point of departure from the hydrostatic curve to the failure point, and finally (5) a set of formulas for the post-peak region. Alongside, relevant details and shortcomings of existing models will be discussed in each part. Finally, the accuracy and efficiency of the proposed model have been verified in a set of simulations which compare well with the experimental results from the literature.
 
Key Words
    active confinement; concrete; failure strength; stress-strain model; hydrostatic response; numerical modeling
 
Address
Sharif Shahbeyk, Mahshid Z. Moghaddam and Mohammad Safarnejad: Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Jalal Ale Ahmad Highway, P.O. Box 14115-143, Tehran, Iran
 

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